Paddy wrote:
> I don't necessarily disagree with Todd's thoughts as to the constitiution
>of the 3 layers, I was more interested in why he thought what he did rather
>than what he thought (all due respect to Todd). It should be easy to test
>what the top layer is by performing an acid esterifcation with methanol and
>confirm that it is free fatty acid - has anyone done this yet?
Why don't you stop hedging and just answer the question Paddy? Why do
you think the three layers are not what Todd and I say they are, and
what do you think they are? If you doubt the top layer is FFA then
why don't you perform an acid esterification with methanol as you
suggest? You're the one with all the doubts, it's up to you to
provide some sort of basis for all your doubts at last.
Keith
>Also, whilst
>on the subject of FFA's, with the feedstock that I have been using the
>'foolproof' method does not yield glycerine that can be collected. Common
>sense says to me that if you don't remove the product of the reaction it
>will simply go into reverse when the base catalyst is used. Excess
>methanol could be used to make the glycerine float in the methanol layer and
>this would take the water with it, which could then be removed. The
>literature I have read recently
>suggests a 2 stage acid reation with excess methanol, removing the methanol
>layer at the top each time. ('biodiesel production from oils and fats with
>high free fatty acids, Canacki and Gerpen 2001'). My own conclusions about
>FFA's are:
>1. They are probably soluble with glycerol and water
>2. They have higher melting points than their related methyl esters in the
>order of 30 degrees C.
>3. To produce high quality biodiesel that won't coke engines they should be
>esterified with acid and methanol.
>Please discuss!
> I would be happy to scan the paper mentioned above and send it to
>individuals interested, although it is copyrighted and should not be put on
>the 'net without permission - anybody want a copy? .... Paddy
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